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Aspect Ratio Calculator

Find an image aspect ratio, simplify it and calculate a matching height or width.

How to use this tool

  1. Enter the original width and height.
  2. Read the simplified aspect ratio.
  3. Optionally enter a target width or height.
  4. Use the calculated dimension for a crop or resize.

Before and after example

Before

Any image width and height in pixels.

After

A simplified ratio such as 16:9 and a matching dimension.

Settings explained

The ratio is reduced using the greatest common divisor. The proportional field keeps the original shape instead of stretching.

Frequently asked questions

Does aspect ratio change image quality?

No. It describes shape only. Quality changes when the image is resized, cropped or recompressed.

What is a common social ratio?

Square 1:1, landscape 16:9 and portrait 9:16 are common examples.

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Privacy of your files

Files selected here are processed in your browser and are not uploaded to PNGimg. The result is created locally and downloaded directly to your device. If you close the page, temporary browser memory used by the tool is released. Do not use any online tool for confidential files unless your own security policy allows it.